Homidia formosana Uchida, 1943

Shi, Shi-Di, Pan, Zhi-Xiang & Zhang, Feng, 2010, A new species and a new record of the genus Homidia Börner, 1906 from East China (Collembola: Entomobryidae), Zootaxa 2351, pp. 29-38 : 34-38

Homidia formosana Uchida, 1943 n. comb.

Figs 23–45 , Table 2

H. sauteri formosana var. Uchida, 1943 H. sauteri formosana ssp. Salmon, 1964 Type locality. Meixi, Taiwan.

Specimens examined. 1 female neotype and 16 females on slide, 30 in alcohol, CHINA: Zhejiang Province: Taizhou City, Daochen Island, 5.vi.2006, collection number S3069 and 28.v.2009, collection number S 09052801, collected by Zhi-Xiang Pan. Additional record: CHINA: Zhejiang Province: Taizhou City, Dalei Mountain, 2.xii.2009, collection number S4037, S4038, collected by Zhi-Xiang Pan. Eight specimens (3 on slide and 5 in alcohol) deposited in Nanjing University and others (14 on slide and 25 in alcohol) including the neotype in School of Life Sciences, Taizhou University, China.

Redescription. Body length up to 2.91 mm.

Colour pattern. Ground colour yellow brown in alcohol ( Figs. 23–24 ). Eye patches dark blue and with small cycloidal patch anteriorly. Ant. II–IV with blue pigment and gradually darker towards tip. Femur of mid and hind leg slightly pigmented. Abd. IV anteriorly with broad, posterior narrow transverse bands and lateral longitudinal stripes. Abd. V entirely dark.

Head. Eyes 8+8, G and H smaller than others, and sometimes invisible under light microscope ( Fig. 25 ). Antenna 1.9–2.2 times as long as cephalic diagonal; basal Ant. I with 3 dorsal and 4 ventral spiny setae; distal Ant. II with 4–8 rod-like sensory setae ( Fig. 26 ); Ant. III organ with 2 rod-like sensory setae ( Fig. 27 ); Ant. IV apical bulb bilobed ( Fig. 28 ). Dorsal cephalic chaetotaxy (following Szeptycki 1973) with 3 antennal (A), 3 ocellar (O) and 5 sutural (S) macrochaetae ( Fig. 25 ). Labral papillae absent. Prelabral and labral setae as 4/5, 5, 4, all smooth. The maxillary outer lobe with 1 apical seta and 1 subapical seta, subapical seta subequal to apical one; sublobal plate and 3 hairs ( Fig. 29 ). Labial palp with five main papillae A–E (following Fjellberg 1998) with 0, 5, 0, 4, 4 guard setae, respectively; lateral process differentiated, with tip reaching (rarely slightly longer) apex of same papilla. Proximal with 5 macrochaetae ( Fig. 30 ). Setal formula of labial base as M, R, E, L1 and L2 (following Gisin 1964); setae E and L1 smooth and others ciliate ( Fig. 31 ).

Thorax. Th. II with 4 (m1, m2, m 2i, m 2i 2) medio-medial, 3 (4) (m4, m 4i, m4p; m4pi rarely present) medio-sublateral and 3 s-chaetae, p6 as mesochaeta. Th. III with 34–37 macrochaetae and 2 s-chaetae ( Fig.

32). Coxal macrochaetae formula as 3/4+1, 3/4+2 ( Fig. 33 ). Trochanteral organ with 24–31 smooth spiny setae ( Fig. 34 ). Inner differentiated tibiotarsal setae slightly ciliate, most distal one on hind leg smooth. Tenent hair clavate and slightly longer than inner edge of unguis. Unguis with 1 outer, 2 lateral and 3 inner teeth, all small to minute; unguiculus lanceolate with outer edge slightly serrate ( Fig. 35 ).

Abdomen. Abd. I with 9 (a2, a3, m2–4, m 2i, m 4i, m4p, a5) macrochaetae and 2 s-chaetae. Abd. II with 5– 6 (a2, a3, m3, m3e, m3ea, m3ep; m3ea rarely absent) central, 1 (m5) lateral macrochaetae and 2 s-chaetae. Abd. III with 1 (m3) central and 4 (am6, pm6, m7a, p6) lateral macrochaetae and 3 s-chaetae ( Fig. 36 ). Abd. IV with 8–11 macrochaetae on anterior part of each side (Em), arranged in irregular transverse row; posterior part with 6 (7) (A4, A6, Ae7, B4–6; A5 rarely present) macrochaetae ( Fig. 37 ). Abd. V with 3 s-chaetae; m3a, a 5i and m5a as mesochaetae ( Fig. 38 ). Anterior face of ventral tube with many ciliate setae, among them 3+3 as macrochaetae, line connecting proximal (Pr) and external-distal (Ed) macrochaetae oblique to median furrow ( Fig. 39 ); lateral flap with 6–7 smooth and 7–12 ciliate setae ( Fig. 40 ); posterior face with 5 subapical smooth (middle one shorter than others) setae ( Fig. 41 ). Ratio of manubrium:(dens+mucro)=1:1–1.1. Manubrial plaque with 3 pseudopores, 2 inner and 3–8 outer ciliate setae ( Fig. 42 ). Dentes with 10–17 spines, basal (bs1 and bs2) and proximal-inner (pi) setae (following Szeptycki 1973) spiny, thick and ciliate; bs2 thicker and slightly longer than bs1; pi apparently longer than bs1 and bs2 ( Fig. 43 ). Mucro bidentate with subapical tooth obviously larger than apical one, basal spine short, with tip reaching subapical tooth ( Fig. 44 ). Tenaculum with 4+4 teeth and 1 large, multi-laterally, apical tapered ciliate basal seta ( Fig. 45 ). Genital plate papillate.

Ecology. In leaf litter of Liquidambar formosana Hance.

Remarks. It is impossible to re-examine the holotype described by Uchida (1943) because the institution in which it was deposited (Aomori Prefectural Museum, Japan) has lost the holotype and subsequent authors did not provide any additional descriptions. We therefore erect a neotype here. The specimens for the present study were collected from a small island, which is located between Zhejiang Province and Taiwan, that shares a similar geographical distribution and climate with the the type locality in Taiwan. They agree well with all characters in the original description of H. sauteri formosana , such as colour pattern (two transverse bands on Abd. IV and dark Abd. V), claw structure, mucro and trochanteral organ. We therefore consider the species as a new record and not a new species for the Chinese mainland. We have provided more details of the Ant. IV apical bulb, chaetotaxy of labium, dorsal head and body, mouth parts, ventral tube, basal dental setae, and manubrial plaque.

Here, we raise the subspecies to the species level because of some distinct differentiating features ( Table 2). As a distinct species, H. formosana n. comb. differs from H. sauteri , which is a widespread species in Southeast Asia, in colour pattern (thoracic bands absent in H. formosana n. comb. but present in H. sauteri ), labial seta L1 (smooth in H. formosana n. comb. and ciliate in H. sauteri ), number of spiny setae on trochanteral organ and dental spines (fewer in H. formosana n. comb.), and macrochaeta a2 on Abd. III (absent in H. formosana n. comb. and present in H. sauteri ).

H. formosana n. comb. H. sauteri Dark bands on Th. II–Abd. III absent present Seta L1 on labial base smooth ciliate Trochanteral organ spiny setae 24–31 42–55 Macrochaeta a2 on Abd. III absent present Line connecting Pr and Ed to median furrow on anterior face of ventral tube oblique parallel pi on dental base spiny slender Dental spines 10–17 23 –53

Figures

FIGURES 23 – 24. H. formosana n. comb. 23 – 24, colour pattern. 23, lateral view; 24, dorsal view.

FIGURES 25 – 35. H. formosana n. comb. 25, dorsal cephalic chaetotaxy; 26, distal Ant. II; 27, Ant. III organ; 28, apical bulb on Ant. IV; 29, maxillary outer lobe; 30, labial palp; 31, labium; 32, dorsal thoracic chaetotaxy; 33, coxal macrochaetae (A, fore legs; B, mid legs; C, hind legs); 34, trochanteral organ; 35, claw on hind leg.

FIGURES 36 – 45. H. formosana n. comb. Dorsal abdominal chaetotaxy. 36, Abd. I – III; 37, Abd. IV; 38, Abd. V; 39 – 41, ventral tube. 39, anterior face; 40, lateral flap; 41, posterior face; 42, manubrial plaque; 43, basal part of dens; 44, mucro; 45, tenaculum.